Induction-coil core



May 117 1927.

G.` s, CHAUNCEY INDUCTION con. CORE Filed Dec. 20. 1924 Patented May 17, 1927.

'UNITED STATES PATENT OFFICE..

INDUCTION-GOIL GORE.

Application filed December 20, 1924. Serial No. 757,228.

This invention relates to improvements in induction coils, particularly' to types used in connection with aerial telephony and radio apparatus, known as timing coilsv` and its principal object is to provide a particularly simple and etficient core or trame upon `which the coils arewound.

Another aim is in the provision oit a core capable ot being dismembered betere the windings are applied, and packed closely in small compass, and aifter beingl wound 'to present a structure characterized by lightness, strength and effectiveness in operation.

A 'further feature is to produce a core that can be produced at a tar less expense than is usual, by punch press dies, whereby uni- '.ormity and interchangeability ot parts are assured.

These and other .important aims and objects are accomplished by the .novel construction, combination and arrangement of part-s hereinafter described and illustrated in the accompanying drawing, constituting` a material part o't this disclosure, and in which Figure 1 is an end elevational view oi a coil having a core made in accordance with the invention, parts being broken away to disclose the construction.

Figure 2 is a longitudinal sectional view taken on line 2 2 of Fig. 1.

Figure 3 is a perspective view ot one ot the heads oi the core in detail.

ligure i is a similar view ot one ot the outer bars or slats used 1n the core construction.

Figure is a like view ot one ol' the inner bars used therein.

Figure 6 is a perspective view showing a modified inner bar.

In general terms, the invention may be described as being composed ot' a pair ot' heads, alike in all respects, containing radial slots in which arc seated inner and outer layers ot bars, having interengaging edges, these bars being held securely in place by the windings of the wire coils, all parts ot the core being composed o't dielectric sheet ma terial, preferably that known as bakelite.

In the drawing, the numeral 1() design nates the end members or heads, the same being cylindrical or polygonal as shown as preferred, and provided with uni'tormly spaced radial slots 11 in their peripheries, the slots being uniform in width and depth.

A central opening 12 provides tor the insertion ot an arbor when Winding the coils, and atterwards'to admit a screw-driver or other like implements in fastening the structure to a panel and such other purposes as may occur, smaller openings 13 providing means to insert securing devices and also for the attachment ot binding posts or like terminals.

The inner bars ist contain notches 15 in their bottom edges adjacent the ends, these notches being ot equal depth and ot a width equivalent to the thickncssot' the heads 1l), while the thickness ot the bars is equal to the width ot the slots 11, so that when assembled as tobe fairly rigid.

in the opposite, outer edge, are a succession ot' equi-distant serrations 16, the same being oi' such depth and so spaced as to receive the windings ot a primary coil 17, or, as shown in Fig. 6, a recess 18 may be made in the outer edge for a similar but closer winding, the length oit the recess 1S or number ot depressions 16, being such as is indicated by good practice.

Also in the outer edges ot the inner bars are recesses 19 to engage projections 20 on the inner edges of the outer bars 21, the same being equal in length and thickness to the inner bars, but ot' less Width, as shown, and the secondary coil 22 is wound upon the outer bars as indicated.

All these several parts are obviously cheaply produced by dies, no other finishing being required and the assembling is ot simple nature, it being merely necessary to insert the bars 14- into the slots 11, bringing the notches 15 to restin the bottoms ot the lots, and then apply the primary winding W hen this has been done, the inner edges ot the outer bar 21 are entered into the slots to seat on the inner bars, the projections 2O iitting the recesses 19 to prevent relative end movement, and the secondary windings 22 applied, binding the structure firmly together.

It is considered preferable that the bars l-l and 21, when assembled, do not extend above the slots l1, but rather that there is a small open space at the outer ends oi' the slots, so that. the heads or discs 1() amply protect the coils and avoid damage by possible rough ham'lling, and to the same purpose the ends ot the bars extend outward beyond the heads in the manner shown.

It is to be noted that no specific Wiring is claimed, the invention residing in the core, frame or drum as disclosed, but it is advanced that due to the open Winding elfect obtained, the coil is particularly sensitive and effective in operation.

Although the `foregoing is descriptive of the foregoing embodiment ot the invention, it will be apparent that minor vvchanges may he made in its construction, Without the exercise ot invention or conflicting with the scope of the claims hereto'appended.

Having thus described my invention what l claim as new and desire to secure by Letters Patent, is zf l. A coil core comprising a pair olf du )licate heads having equally spaced open radial slots in their peripheries, a series ot' bars fitting the slots and having notches engaging the bottoms thereoi", means in said bars to receive thewindings of a coil, and a second series ot bars disposed in the slots over the lirst named bars, said second bars receiving the windings of another coil, all ol: said bars extending uniformly outward beyond said heads.

2. A coil core comprising a pair ot dunlicate heads having equally spaced open rac ial slots in their peri heries, a series of bars fitting the slots am having notches engaging theybottoms thereof, and being recessed on their outer edges, a primary coil disposed in one of the recesses, a second series of 'bars disposed in the slots in said heads over the first bars, projections on said second bars to engage in another of the recesses in the first bars, an another coil disposed on said second bars.

3. A coil core comprising a pair of polygonal heads containing open radial slots at the junctions of the angles and having central openings, bars litting the slot-s, said bars having notches engaging the bottoms ot the slots, a series of serrations in the outer edges of said bars to receive a primary coil. other bars superii'nposed on the first bars, the last named bars receiving another coil, and tongue and groove connections between the first and last bars.

4. A coil core comprising a pair of polygonal heads containing open radial slots at the junctions of the angles and having central openings,4hars fitting the slots, said bars having notches engaging the bottoms u1 the slots, means in the outer edges of said bars to receive and segregate the windings of the primary coil, a second series of bars oven lying the first named bars, all of said bars extending outwardly beyond the heads and Within the profiles thereof, said last named bars receiving the windings oit a secondary coil, interengaging means between the juxtaposed bars to prevent relative end movement, and means in said head to receive binding posts.

This specification signed this 19th day of December, 1924.

GEORGE S. CHAUNCEY. 

